Would the a/c affect that. Today, the car was fine since the codes were cleared again last night. The a/c was on, set at 72 but didn't seem to be running as cold as it should have, so I pushed the auto control to set it to 70 and as soon as I did that, the check engine light came on again. I don't think its blowing as cold as it should. I didn't think that O2 sensors had anything to do with the a/c.